Protective element



FI H. GRANT.

PROTECTIVE ELEMENT.

APPLICATION FILED FB.10.1915.

, l I 1 9390 1 3, I Patented Aug. 1, 1916.

-A .N E,W W

r/ 7 r f d' Fran/f H ra/72 FRAN K HIALZLv GRANT, 0F ST. CLAIR HEIGHTS, MICHIGAN.

PEoTEcTIvE ELEMENT.

specification of Letters Patent.

Patented Aug. 1, 1916.

Application led February 10, 1915. Serial No. 7,428.

7 1o all whom t may concern:

Be it known that I, FRANK HALL` GRANT, a citizen of the Dominion of Canada, and a resident of St. Clair Heights, in the county of Wayne and State of Michigan, have in Vented a new and Improved Protective Element, of which the following is a specificat1on.

This invention relates to a laminated composite protective element suitable of use for numerous purposes, 'but especially adapted for interior and exterior coverings for buildings, and in the formation of decorative and protective articles. It is necessary that such elements be capable of resistingthe action of the weather and of blows; and in many lnstances, it is also highly desirable that they may serve to deaden vibratlons and sound, and be susceptible of receiving fine details of an embossed design. The matter of expense is, furthermore, of prime importance.

The present invention consists in a very cheap laminated protective element possessing all of the above mentioned physical characteristics, and one much cheaper than elements now in use.

In the accompanying drawings, Figure 1 is a plan view of a protective element made according to my invention and suitable for ceilings, wall facings and the like. Fig. 2 is an enlarged section on the line '2 2 of Fig. 1, showing also the manner of forming and embossing the element in a press. Fig.'

3 shows a similar element being formed Without embossing. Fig. 4 shows al modified form of embossed element in a press. l

Similar reference characters refer to like partsthroughout the several views.

lReferring to the embodiment of the 1nvention shown in Figs. 1 and 2, 1 indicates a thin sheet metal base plate, preferably of terne or tin plate, or of steel, that, 1n use, contacts directly with the wall or other support to which the protective element is applied, and is of strength sulicient to resist all stresses to which the element is subjected. The base plate in turn serves as a support for a filler 2, preferably asphalt or similar bituminous compound, somewhat thicker than the former; and the latter constitutesv a backing for a very thin ductile metal sheet or cover plate 3, preferably copper, the strength of which is practically negligible, so far as offering resistance to the primary stresses to which the sheet is subjected is concerned. An important functlon of the copper sheet is that lof receiving and retalnlng the lines of any desired'design,

`and of assuming natural colors that har- `momze wlth standard finishes of furniture.

The mutual relation ofthe lcopper sheet and the viscous backing is also important in that blows upon the former, incident 'to ordinary usage, merely cause it to sink into the latter, and are absorbed without tearing, the copper sheet; and the filler serves the purpose of deadening vibrations and sound, and acts as a heat insulating-medium.

In the design shown, the base plate is provided with a series of longitudinal edge ribs 4, a second series of diagonal corner ribs 5, and an inner foliated rib 6, the portion 7 between the two rst mentioned sets of ribsand theportion 8 between the adjacent curves of the rib 6 being substantially flat. It will loeV noticed that the ribs rise rather gradually fromv the fiat body.of the sheet and correspond roughly to the more pronounced features of the design, but would fail to present a design of fine detail; in fact, it would be impossible to impress such a design-on the base plate for the reason that the latter, when of metal of suficient strength and proper quality to resist the stresses to whlch the element is subjected', possesses too great strength and is too hard to admit of being molded along ne lines, nor would it be possible to impress it on a copper cover sheet of suficient strength to resist the stresses to which the protective element is subjected.- The upper or outer sheet 3 is also provided with two sets of ribs 10 and '11, and with an inner foliated ribK 12, that correspond, respectively, to the sets of ribs 4 and 5 and to the rib 6 heretofore described.

The transverse curvature of the ribs-on the outer sheet is, however, much sharper than that of those on the base plate, as is shown in the drawing, whereby a distinct and accurate design in these particulars is produced; and the area corresponding to the flat por- .tion 7 of the base plate may have impressed thereon, in fine detail, portions of the design as indicated at 1f.

layers of the composite element are irmly` the thin' sheet 3, the early part of the movement 4servesjto frictionally secure the sheet to the face of the die 19, whereby the former is prevented from moving bodily laterally to any appreciable extent. The pressure in creaslng, the thin sheet 3 is first shaped 'to the general configuration of the ribs or grooves in the die 19, after which the ribs are formed in the base plate 1; and, .as the. die approaches the limit of its movement, the thin metal sheet 3 is further stretched and forced outwardly by the plastic as- ,phalt, which distributes the heavy 'pressures secured together. v

Either one or both of the dies may be movable;kand the sheet as a whole may be reversed from the position shown, in which vertical throughout, whereas the action of' case the desired design would, of course, appear upon the lower die. Furthermore, the design may either be in relief or intaglio. It will also'be noticed that the filler 2 acts substantially as a part of the male die, in that it transmits pressure to the sheet 3 in such directions as to make the latter conform tothe design in the upper or female die. rIhe male 'die 15, ifapplied directly to the sheet 3, would tend to tear the latter,l

since the pressures would be substantially the filler on the sheet is analogous tothat of hydraulic pressure, and causes gradual stretching without abrasion.

Fig. 3 shows a non-embossed sheet, the base plate 20, filler 2l and cover sheet 22 of which correspond to the sheets heretofore described and are cemented together by presjsure of the dies 23 and 24.

In the embodiment shown in Fig. 4, the element as a whole is crowned and the central portion 25 of the upper sheet is em- `bossedin fine detail similar to the portion 13, already described. As the parts correspond in relative position to those shown in Fig. 2, they have beengiven the same reference numerals. f

It is obvious that many changes may be made in the details of the .design without departing from the spirit yof m invention. Also other soft ductile metals, or'eXample, lead, may be used'in certain instances in lieu of copper. I do not, therefore, wish to be limited otherwise than as indicated by the subjoined claims. I l

I claimzf 1. A composite protective element prisinga base plate consisting of' a thiri sheet of relatively. hard metal of strength suflicient to withstand the stresses to which the element is to be subjected, a thin filler sheet of viscous material, and .a very thin cover sheet of soft ductile metal, the cover sheet andthe base plate being cemented throughout to the filler sheet and the cover sheet having the details of thedesign formed thereon, portions of the design on the cover sheet being located'at different perpendicular distances from the corresponding portions of the base plate. p

2 A composite protective element com prising a base platey consisting' of a thin sheet of relatively hard metal-of strength sufficient to withstand the stresses to which the element is to be subjected, a thin filler sheet of sticky `bituminous material, and a very thin cover sheet of copper, the metal sheets being cemented throughout, to the iiller sheet and the cover sheet having the details of the design formed thereon, portions of the design on the cover sheet being located at dierent perpendicular distances fiom the corresponding portions of the base p ate. y

3. A composite protective element oomprising a base plate consisting of a thin sheet of relatively hard metal of strength suicient to withstand the stresses to which the element is to be` subjected, a' thin filler sheet of viscous material, and a very thin cover sheet of soft ductile metal, the metal sheets being .cemented ythroughout to the .filler sheet and the cover sheet having the details of the design formed thereon, portions of the design on the cover sheet being located at different perpendicular distances from the corresponding portions of the base plate, a portion of the base plate being raised from the general plane of the plate to correspond roughly to a pronounced portion of the design on the cover sheet.

4. A composite protective element comprising a ybase plate consisting of a thin sheet of relatively hard metal 'of strength suficient to withstand the stresses to which the element is to be subjected, a thin filler sheet of sticky bituminous material, and a very thin cover sheet of copper, the metal sheets being cemented throughout to the filler sheet and the cover sheet having the details of the design formed thereon, ,portions of the. design on the cover sheet being located at different perpendicular distances from the corresponding portions of the base plate, a portion of the base plate being raised from the general plane of the plate to correspond roughly to a pronounced portion of the design on the cover sheet.

5..A composite protective element comprismg a baseplate consisting of a thin sheet of 4relatively hard metal of strength sufficient to withstand the stresses to which thereon, portions of the design on the. cover cient to withstand the primary stresses to sheet being located at diierent perpendicular distances from the correspondlng por' tions of the base plate.:

6. A composite protective element comprising a metal base sheet of strength sufwhich the element is to be subjected, a thin filler sheet of lviscous material, and a cover sheetl of soft ductile metal of less thickness and the cover sheet being cemented throughout tothe filler sheet by the material of thel latter and the cover sheet having the details of a design formed thereon, portions of the design on 'the cover sheet being located at different erpendicular distances from the corresponding portions of the base sheet.

In testimony whereof I sign this specification in the presence ofA two subscribing witnesses.

FRANK HALL GRANT. 

